Place value die. a cube for tens and ones. Can easily be extended for larger numbers. hundreds, one thousands, ten thousands etc. Students can also build numbers with bean sticks or unifix cubes if they're not ready for base 10 blocks
I think you could also have multiple pipe cleaners coming from one number and students have to show multiple ways to add numbers to get to that number. Counting with pipe cleaners and beads. Great for fine motor development too.
Ice Cream Numbers - preschool summer math that explores fine motor skills, counting, one-to-one correspondence, and more early math skills Mehr zur Mathematik und Lernen allgemein unter zentral-lernen.